The film follows the title teenage heavy metal band who acquire an ancient piece of sheet music and unwittingly summon an evil entity known as "The Blind One".

As Brodie delves deeper into the Black Hymn's meaning, he discovers its connection to dark forces and the possession of the town's residents by Aeloth, a powerful demon.

Seeking answers, Brodie and Zakk consult a fortune teller named Abigail, who reveals the demonic presence and the impending merging of Aeloth with the most evil human in town by 3 AM.

The site's consensus states: "Deathgasm plumbs the blood-spattered depths of grindhouse gore with enough giddy glee to satisfy genre enthusiasts looking for a thrill.

[6] Dennis Harvey of Variety wrote that the script does not live up the vivid splatter effects, but the film's "consistent if undiscriminating high energy engenders a certain persuasive goodwill".

[7] Richard Whittaker of The Austin Chronicle wrote, "Shamelessly low-brow, reaching a beer-fueled gleeful high with a zombie-vs.-sex toys battle, it's a very metal tribute to the grand tradition of Kiwi splatter comedies.

[10] Drew Tinnin of Dread Central rated it 4/5 stars and wrote, "Deathgasm knows exactly what it is and where its heart is, giving genre fans a welcome return to heavy metal in horror without cutting back on any of the splatstick that New Zealand has become known for, for better or worse.

"[11] Zach Gayne of Twitch Film wrote, "[T]he voice that shines through the hysterical dialogue and playfully comic editing, is so teenage, so punk, it makes a beat-to-death genre feel refreshing.

"[12] Heather Wixson of Daily Dead rated it 5/5 stars and called it a "ridiculously fun and bombastic celebration of horror and heavy metal".

If you thought the first Deathgasm was puerile, juvenile and dumb, then Goremageddon will melt your face off and force you to barricade yourself inside, safe with some Terrence Malick and Coldplay."